package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;
    /**
     * 自定义删除分类
     * @param id
     */
    @Override
    public void removeCategoryId(Long id) {
        //1注入需要的service
        //2查询删除的分类是否关联了菜品和套餐
        LambdaQueryWrapper<Dish> dlqw = new LambdaQueryWrapper<>();
        dlqw.eq(Dish::getCategoryId,id);
        int count1 = dishService.count(dlqw);
        if (count1>0){
            //分类下有菜品,无法删除,抛出业务异常
            throw new CustomException("该分类下有菜品,无法删除");
        }
        LambdaQueryWrapper<Setmeal> slqw = new LambdaQueryWrapper<>();
        slqw.eq(Setmeal::getCategoryId,id);
        int count2 = setmealService.count(slqw);
        if (count2>0){
            //分类下有套餐,无法删除,抛出业务异常
            throw new CustomException("该分类下有套餐,无法删除");
        }
        //分类下没有菜品和套餐,可以删除
        removeById(id);
    }
}
